Headphone



FIG. 1 is a perspective view of a headphone showing the new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right-side view thereof;

FIG. 5 is left-side view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear view thereof.

The broken lines are for environmental purposes only and do not form any part of the claimed design. 

CLAIM The ornamental design for a headphone, as shown and described. 